FKIE_CVE-2026-23326

Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-04-23 21:11
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: Fix fragment node deletion to prevent buffer leak After commit b692bf9a7543 ("xsk: Get rid of xdp_buff_xsk::xskb_list_node"), the list_node field is reused for both the xskb pool list and the buffer free list, this causes a buffer leak as described below. xp_free() checks if a buffer is already on the free list using list_empty(&xskb->list_node). When list_del() is used to remove a node from the xskb pool list, it doesn't reinitialize the node pointers. This means list_empty() will return false even after the node has been removed, causing xp_free() to incorrectly skip adding the buffer to the free list. Fix this by using list_del_init() instead of list_del() in all fragment handling paths, this ensures the list node is reinitialized after removal, allowing the list_empty() to work correctly.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a9ea988465ece5b6896b1bdc144170a64e84c35Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/60abb0ac11dccd6b98fd9182bc5f85b621688861Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/645c6d8376ad4913cbffe0e0c2cca0c4febbe596Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b38cbd4af5034635cff109e08788c63f956f3a69Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.13
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: Fix fragment node deletion to prevent buffer leak\n\nAfter commit b692bf9a7543 (\"xsk: Get rid of xdp_buff_xsk::xskb_list_node\"),\nthe list_node field is reused for both the xskb pool list and the buffer\nfree list, this causes a buffer leak as described below.\n\nxp_free() checks if a buffer is already on the free list using\nlist_empty(\u0026xskb-\u003elist_node). When list_del() is used to remove a node\nfrom the xskb pool list, it doesn\u0027t reinitialize the node pointers.\nThis means list_empty() will return false even after the node has been\nremoved, causing xp_free() to incorrectly skip adding the buffer to the\nfree list.\n\nFix this by using list_del_init() instead of list_del() in all fragment\nhandling paths, this ensures the list node is reinitialized after removal,\nallowing the list_empty() to work correctly."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxsk: Corrige la eliminaci\u00f3n de nodos de fragmento para prevenir una fuga de b\u00fafer\n\nDespu\u00e9s del commit b692bf9a7543 (\u0027xsk: Elimina xdp_buff_xsk::xskb_list_node\u0027), el campo list_node se reutiliza tanto para la lista de la piscina xskb como para la lista de b\u00faferes libres, esto causa una fuga de b\u00fafer como se describe a continuaci\u00f3n.\n\nxp_free() comprueba si un b\u00fafer ya est\u00e1 en la lista de libres usando list_empty(\u0026amp;xskb-\u0026gt;list_node). Cuando se usa list_del() para eliminar un nodo de la lista de la piscina xskb, no reinicializa los punteros del nodo. Esto significa que list_empty() devolver\u00e1 falso incluso despu\u00e9s de que el nodo haya sido eliminado, causando que xp_free() omita incorrectamente a\u00f1adir el b\u00fafer a la lista de libres.\n\nSoluciona esto usando list_del_init() en lugar de list_del() en todas las rutas de manejo de fragmentos, esto asegura que el nodo de la lista se reinicialice despu\u00e9s de la eliminaci\u00f3n, permitiendo que list_empty() funcione correctamente."
    }
  ],
  "id": "CVE-2026-23326",
  "lastModified": "2026-04-23T21:11:17.750",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-03-25T11:16:29.687",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-787"
        }
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      "source": "nvd@nist.gov",
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}


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